Latch and lock



(No Model.)

J. E. ARMSTRONG.

LATCH AND LOOK."

NO. 508,267. Patented Nov. 7, 1893.

wk m.

' UNITED STATES PATENT OFFICE.

JOHN E. ARMSTRONG, or SANTAGRIIZ, CALIFORNIA.

LATCH AN D LOCK.

SPECIFICATION forming part of Letters Patent No. 508,267, dated November7,1893.

' Application filed July 13,1893. s ra um. 480,394. (No model.)

To all whom it may concern.-

Be it known that I, J OHN E. ARMSTRONG, a citizen of the United States,residing at Santa Cruz, Santa Cruz county, State of California, haveinvented an Improvement in Latches and Locks; and I hereby declare thefollowing to be a full, clear, and exact description of the same.

My invention relates to that class of cornbined latches and locks inwhich the knob spindle is provided with a cam engaging the latch shankin such a manner asto, retract it either by the axial or by thelongitudinal movement of the spindle.

My invention consists in the novel connection between the knob spindlecam and the latch shank, in the means for looking and unlocking saidspindle, and in other details of construction and arrangement, all ofwhich I shall hereinafter fully describe.

The object of my invention is to improve and simplify the latch andlock, and to provide an efficient and easily operated device of thischaracter.

Referringto the accompanying drawings for a more complete explanation ofmy in- Vention,-Figure 1 isa section on the line yy of Fig. 2. Fig. 2 isa section on the line.

wm of Fig. 1. Fig. 3 is a perspective view of the sleeve of the innerknob showing the locking device. Fig. 4 is an elevation of the outerrose plate showingthe adjustable connection of the lever E with one ofits posts (1.

A is a door. B is a sheath let into the door, and in this is fitted andadaptedto slide the shank c of the latch 0, said shank having behind ita spring 0' which projects it.

D is the outer rose plate. This has three posts d which enter the door.Upon one of these posts is pivotally hung a lever E, the lower end ofwhich enters a slot 0 in the latch shank c. The connection of this leverwith the post (1 from which it is hung is an adjustable one, hereeffected by externally threading said post and screwing the leverheadupon it. This permits the lever to swing and at the same time to bemoved to difierent points on thepost in order to adaptit to po-' sitionin doors having different thicknesses.

F is the knob spindle. This is formed with the cam f which bears upon.lever' E. This cam has a plane and an inclined face, the

former being transverse of the spindle and the latter in itslongitudinal plane. As the spindle is turned axially, the edges of thecam bear upon and force back the lever E, thus retracting the latch. Asit is moved longitudinally, the inclined face of the cam acts in similarmanner upon thelever and results in retracting the latch.

, G is the inner rose plate. This is fitted to the door and is securedby screws g, which pass into the posts dof the outer rose plate, thussecuring both rose plates firmly and avoiding the use of any screws forthe outer rose plate.

H is the outer knob, the sleeve h of which passes through the outer roseplate, and is secured to the spindle by a screw h within the rose plate,thus concealing and protecting it.

' I is the inner knob, and its sleeve 11 passes through the inner roseplate. It is securedto the spindle without said plate by a screw 'L'.

Both these securing screws h and i are adapted toenter any of a seriesof holes f in the spindle whereby the knobs may be adj usted out or-in,to suit different thicknesses of doors.

'Thelocking mechanism is as follows: In the sleeve 71 of the inner knobis a longitudinal slot t which joins at its outer end a cross slot 1Within the sleeves lies a locking arm J, which is'provided at its outerend with cross trunnions j lying and pivoted in the cross slot 0?. vThis end has also adownwardly extending short crank j. The inner end ofthe arm J has a pawl hook 7' which is adapted, by the movement of thearm to playthrough the inner end of the slot 2' of the sleeve. The armalso has a finger lug 7' which also plays up through said slot. Aspring7' is seated within the outer end of the sleeve and bears upon the crankj whereby its efiect is to throw and hold the inner end of thelockingarm up with its pawl hook and its finger lug projecting through the slotof the sleeve. The pawl hook lies within the inner rose plate G, and inthis plate on the inner side of its hub are notches g with which thepawl hook engages thereby lockingthe spindle and preventing its movementeither axially or longitudinallyand thereby preventing the operation'ofthe latch. Thus an automatic spring locking latch results. But-torelieve it,,the

operator presses down on the finger lug 9' whereby the locking arm isforced down and its hook pawl disengaged from the notches of the roseplate.

To release the look from the outer side by means of a key, I have a pushrod- K. This lies in agroove f in the side of the knob spindle. Itsouter end enters the sleeve of the outer knob, and its inner end entersthe sleeve of the inner knob and bears against the short crankj of thelocking arm J. A key hole L of any suitable form is made through theouter knob, and in this may be inserted a key Z of corresponding form.The end of this key bears on the outer end of the push rod K, and byforcing it in, causes the inner end of said rod to press back the shortcrank j and thereby to swing downwardly the locking arm J which eiiectsthe disengagement of the pawl hook 7' from the rose plate, thusreleasing the knob spindle. When the key is removed, the spring jreturns the parts to a locked condition. Now, in order to hold thespindle unlocked, when desired,I have mounted upon the sleeve of theinner knob a turnable band M. This is slotted over the screw 4; topermit its movement and to guide it, and it has an opening m, throughwhich the finger lug 7' of the locking arm J projects. By turning thisband, it will pass over and press down the finger lug 3' and hold itdown, thereby keeping the pawl hook out of engagement.

In order to lock the device from within, even against the action of thekey, I make a small hole 3' through the finger lug, and in this a commonpin j may be inserted, to prevent it from being depressed and therebyprevent the pawl hook from moving from its engagement with the roseplate.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a latch, the combination of the latch, having a shank with a slot,the knob spindle having a cam, and the swinging lever pivotally hung atone end and engaged near its center by the cam and having its free endengaging the slot of the latch shank, said lever being adjustable in orout to suit different thicknesses of doors, substantially as hereindescribed.

2. In a latch, the combination of the latch, having a shank with a slot,the knob spindle havinga cam, and the swinging lever actuated by the camand engaging the slot of the latch shank, said lever having a screwadjustment at its suspended end to suit difierent thicknesses of doors,and knobs secured to and adjustable in or out upon the spindle,substantially as herein described.

3. In a latch, the combination of a latch a lever suspended from oneend, the outer rose plate having the posts fitted to the door and uponone of which posts the lever is hung, the inner rose plate having thescrews seated in the posts of the outer rose plate, a knob spindle andconnections between said spindle and the latch'to operate said latch,substantially as herein described.

4. In a latch, the combination of the latch having a shank with a slot,the rose plate having a post fitted to the door, a lever pivoted at oneend on said post and having lts opposite free end engaging the slot ofthe latch shank, and a knob spindle having a cam actuating said lever,substantially as herein described. v

5. In a latch, the combination of a latch having a shank with a slot,the rose plate having a post fitted to the door and externally threaded,a lever screwed upon said post and adjustable thereon, said leverengaging the slot of the latch shank and a knob spindle having a camactuating said lever, substantially as herein described.

6. In a latch and lock, the combination of a latch, a knob spindle foractuating said latch, a knob with a sleeve fitted upon and secured tothe spindle, a swing ng springcontrolled locking arm mounted 1n the knobsleeve and having a hook pawl play ng through said sleeve, a rose platehaving notches with which said hook pawl engages to lock the spindle,and a finger lug on the locking arm projecting through the knob sleevewhereby the hook pawl may be disengaged from the rose plate,substantially as herein described.

7. In a latch and lock, the combination of a latch, a knob spindle foractuating said latch, a knob with a sleeve fitted upon and secured tothe spindle, a swinging springcontrolled locking arm mounted 1n the knobsleeve and having a hook pawl play ng through said sleeve, a rose platehaving notches with which said hook pawl engages to lock the spindle, afinger lug on the looking arm projecting through the knob sleeve wherebythe hook pawl may be disengaged from the rose plate, and a turnable bandon the sleeve adapted to press down the finger lug, substantially asherein described.

8. In a latch and lock, the combination of a latch, a knob spindle foractuating said latch, a knob with a sleeve secured to the spindle, aswinging spring-controlled locking arm mounted in the knob sleeveandhaving a hook pawl playing through said sleeve, a rose plate havingnotches with which the hook pawl engages and a finger lug on the locklngarm playing through the knob sleeve andhaving a hole to receive a pinwhereby the locking arm may be held from moving, substantially as hereindescribed.

9. In a latch and lock, the combination of a latch, a knob spindle foractuating said latch, an inner knob with a sleeve fitted upon andsecured to the spindle, a swinging springcontrolled locking arm mountedin the knob sleeve and having a hook pawl playing through said sleeve, arose plate having notches with which said hook pawl engages and aslidable push rod seated in the knob spindle and having its inner endadapted to .hand.

dle and'having its inner end adapted to engage the locking arm and tomove it to eifect the disengagement of its hook pawl from the roseplate, and an outer knob, havinga keyhole whereby a key may be insertedto engage the outer end of the push rod and operate it,

substantially as herein described.

In witness whereof I have hereunto set my JOHN E. ARMSTRONG. Witnesses:

H. EVMAKINNEY, F. W. MAKINNEY.

